Siphon boat pump



July 26, 1955 H. c. STIGALL 2,713,840

SIPHON BOAT PUMP Filed April 2'7, 1954 I Harry 0. .S'f/gal/ 4 INVENTOR.

United States Patent SIPHON BOAT PUMP Harry C. Stigall, Chicago, Ill.

Appiication April 27, 1954, Serial No. 425,791

2 Claims. (Cl. 114-185) This invention relates to a siphon boat pump, and more specifically provides a device for the attachment to the undersurface of a boat bottom including means for extracting bilge Water from the interior of a boat as the boat moves forwardly through the water by utilizing a vacuum siphon effect caused by the passage of a forwardly and inwardly tapering housing which forms a reduced pressure area adjacent the opened rear end thereof and means for communication of the reduced pressure area to the interior of the boat thereby extracting the bilge water therefrom.

An object of this invention is to provide a siphon boat pump as set forth in the preceding paragraph, which is simple in construction, easy to attach, efiicient in operation, well adapted for its intended purposes and relatively inexpensive to manufacture.

Another object of this invention is to provide a siphon boat pump including a sleeve projecting through the bottornof a boat with a removable plug positioned therein and a tapered housing overlying the sleeve and terminating at its rear end in an enlarged open area and at its front end in an abutment against the undersurface of the boat bottom thereby providing a venturi effect when the boat moves rapidly through the water in a forward direction.

These, together with other objects and advantages which will become subsequently apparent reside in the details of construction and operation as more fully hereinafter described and claimed, reference being had to the accompanying drawings forming a part hereof, wherein like numerals refer to like parts throughout, and in which:

Figure l is a side elevational view showing the siphon boat pump of the present invention attached to the undersurface of a boat bottom adjacent the stern thereof;

Figure 2 is a rear end elevation of the construction of the present invention;

Figure 3 is a bottom plan view showing the details of construction of the siphon boat pump; and

Figure 4 is a longitudinal, vertical sectional view' taken along a plane passing along the longitudinal center line of the boat pump of the present invention showing the details of construction of the tubular sleeve, mounting plate and housing.

Referring now specifically to the drawings, it will be seen that the numeral generally designates the siphon boat pump of the present invention for securing to the bottom 12 of a boat 14 adjacent the stern board 16 thereof.

The siphon boat pump 10 includes a tubular sleeve 18 that is provided with external threads 20 and internal threads 22 and a sleeve 18 is positioned in an opening 24 in the boat bottom 12. A clamping nut 26 is threadedly engaged with the external threads 20 on the upper end of the sleeve 18 and a clamping nut 28 is engaged with the external threads 20 on the lower end of the sleeve 18 and a sealing washer 30 is provided on the inner surface of the lower clamp nut 28. An externally threaded plug 32 having a polygonal upper end 34 for engagement by a suitable wrench is positioned in the tubular sleeve 18 for closing the opening 36 extending therethrough. A mounting plate 38 provided with reversely bent side edges 40 which are forwardly and inwardly converging is secured to the undersurface of the boat bottom 12 by positioning over the externally threaded sleeve 18. It will be seen that the mounting plate 38 is provided with an opening 42 for receiving the sleeve 18 and the mounting plate 38 is disposed between the sealing washer 30 and the undersurface of the boat bottom 12. A generally U- shaped housing 44 has forwardly and inwardly converging side edges 46 which project horizontally outwardly for engagement and reception within the reversely bent side edges 40 of the mounting plate 38 thereby securing the housing 44 to the mounting plate 38. The rear end of the housing 44 is open and terminates in an upwardly and rearwardly inclined rear edge 48 and it will be seen that the opening 36 extending through the tubular sleeve 18 is positioned centrally of the housing 44 with the lower end thereof spaced from the bottom of the housing 44 and the upper end of the sleeve 18 positioned slightly above the bottom of the boat for extracting substantially all of the bilge water contained therein.

In operation, the boat 14 is moved rapidly forwardly through the water and the plug 32 may be removed and the bilge water extracted from the boat 14 due to the suction created by the rearwardly and downwardly tapered housing 44 passing through the water thereby creating an area of reduced pressure within the housing 44 thereby extracting the bilge water from the upper surface of the bottom 12 of the boat 14. The relatively flat lower surface of the housing 44 assures that the water will be directed away from the opened rear end of the housing 44. Obviously, the plug 32 may be utilized when the boat is withdrawn from the water in the usual manner. Further, the device may be constructed of relatively inexpensive material, such as sheet aluminum or any other well known noncorrosive material.

From the foregoing, the construction and operation of the device will be readily understood and further explanation is believed to be unnecessary. However, since nurnerous modifications and changes will readily occur to those skilled in the art, it is not desired to limit the invention to the exact construction shown and described, and accordingly all suitable modifications and equivalents may be resorted to, falling within the scope of the appended claims.

What is claimed as new is as follows:

1. A siphon boat pump comprising a sleeve positioned in the bottom of a boat thereby forming a passage therethrough, a removable plug positioned in said sleeve, and a housing secured to the outer surface of a boat bottom in spaced overlying relation to the opening formed by the sleeve, said housing being generally U-shaped in crosssection and tapered rearwardly and downwardly, the forward end of said housing positioned against the undersurface of the boat bottom and the rear end of the housing positioned below the boat bottom thereby producing an area of reduced pressure within the housing when the boat moves forwardly through water for siphoning bilge water through the sleeve when the plug is removed, said housing including a mounting plate secured to the undersurface of the boat bottom and having forwardly converging reversely bent side edges, said housing having forwardly converging outwardly projecting side edges for reception under the reversely bent edges of the mounting plate thereby securing the housing to the undersur face of the boat bottom.

2. The structure as defined in claim 1 wherein said sleeve is tubular and threaded externally and internally, clamp nuts on each end of said sleeve for engaging the top surface of the boat bottom and the under surface of 3 said mounting plate, and an externally threaded plug en- 965,011 gaging the internally threaded sleeve for closing the pas- 1,720,309 sage through the tubular sleeve. 2,477,014 2,610,014 References Cited in the file of this patent 5 UNITED STATES PATENTS 91 918 933,891 Curry Sept. 14, 1909 4 Pyke July 19, 1910 Wakefield July 9, 1929 Stanley et a1. July 26, 1949 Ananson Sept. 9, 1952 FOREIGN PATENTS Sweden Apr. 1, 1938 

